A new show is in production and should be onboard this fall. Still don't know what show it will replace. I hope Morty, but that is just my personal opinion.
The variety type entertainers change...but we happen to have the same ones we did last year, so it just depends on their rotation on the ship. The live bands also change a bit. I think there were three house bands that rotate between the two ships. Johnny Danger Band, Free Reign Band, and the Charles Marshall Band.
Really no difference between the itineraries than the obvious port changes you mentioned...one less sea day on the Western and the Western has a more definiate Mexican feel to it from the moment you walk on.....the greeting CM's are all wearing sombreos hats and during the week a Mariachi band plays in the restaurants and in the Atrium.
MJ